i see you there. something like that. after that just the shots, like, three or four shots. and i just started running. reporter: gunshots in a quiet residential neighborhood. a now-terrified robby ran back home. he was faster than i am. i said, he s probably coming. i was almost sure that he was coming. reporter: but diren wouldn t return. and what happened to the german exchange student would simultaneously make headlines around the world and get americans asking, how far can you go to protect your home and family? coming up 911. what are you reporting? a robbery. an urgent call to 911. somebody entered into our garage. shots were fired. wer back pain t stop him from keeping up.